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/* SPARC I/O definitions
* (C) Copyright 2007
* Daniel Hellstrom, Gaisler Research,
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
#ifndef _SPARC_IO_H
#define _SPARC_IO_H
/* Nothing to sync, total store ordering (TSO)... */
#define sync()
/* Forces a cache miss on read/load.
* On some architectures we need to bypass the cache when reading
* I/O registers so that we are not reading the same status word
* over and over again resulting in a hang (until an IRQ if lucky)
#define READ_BYTE(var) SPARC_NOCACHE_READ_BYTE((unsigned int)(var))
#define READ_HWORD(var) SPARC_NOCACHE_READ_HWORD((unsigned int)(var))
#define READ_WORD(var) SPARC_NOCACHE_READ((unsigned int)(var))
#define READ_DWORD(var) SPARC_NOCACHE_READ_DWORD((unsigned int)(var))
#define READ_BYTE(var) (var)
#define READ_HWORD(var) (var)
#define READ_WORD(var) (var)
#define READ_DWORD(var) (var)
* Generic virtual read/write.
#define __arch_getb(a) (READ_BYTE(a))
#define __arch_getw(a) (READ_HWORD(a))
#define __arch_getl(a) (READ_WORD(a))
#define __arch_getq(a) (READ_DWORD(a))
#define __arch_putb(v,a) (*(volatile unsigned char *)(a) = (v))
#define __arch_putw(v,a) (*(volatile unsigned short *)(a) = (v))
#define __arch_putl(v,a) (*(volatile unsigned int *)(a) = (v))
#define __raw_writeb(v,a) __arch_putb(v,a)
#define __raw_writew(v,a) __arch_putw(v,a)
#define __raw_writel(v,a) __arch_putl(v,a)
#define __raw_readb(a) __arch_getb(a)
#define __raw_readw(a) __arch_getw(a)
#define __raw_readl(a) __arch_getl(a)
#define __raw_readq(a) __arch_getq(a)
* Given a physical address and a length, return a virtual address
* that can be used to access the memory range with the caching
* properties specified by "flags".
#define MAP_NOCACHE (0)
#define MAP_WRCOMBINE (0)
#define MAP_WRBACK (0)
#define MAP_WRTHROUGH (0)
static inline void *map_physmem(phys_addr_t paddr, unsigned long len,
unsigned long flags)
return (void *)paddr;
* Take down a mapping set up by map_physmem().
static inline void unmap_physmem(void *vaddr, unsigned long flags)
static inline phys_addr_t virt_to_phys(void * vaddr)
return (phys_addr_t)(vaddr);